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Q. |
Ozone-hole in the atmosphere is largely caused by the presence of – |
A. | Oxygen |
B. | Hydrogen |
C. | Chlorofluorocarbons |
D. | Radio-active waste |
Answer» C. Chlorofluorocarbons | |
Explanation: Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. It is calculated that a CFC molecule takes an average of about five to seven years to go from the ground level up to the upper atmosphere, and it can stay there for about a century, destroying up to one hundred thousand ozone molecules during that time. |
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